drivers/phy/broadcom/phy-bcm-ns2-usbdrd.c

   1 /*
   2  * Copyright (C) 2017 Broadcom
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation version 2.
   7  *
   8  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
   9  * kind, whether express or implied; without even the implied warranty
  10  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/extcon-provider.h>
  16 #include <linux/gpio.h>
  17 #include <linux/gpio/consumer.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/io.h>
  21 #include <linux/iopoll.h>
  22 #include <linux/irq.h>
  23 #include <linux/mfd/syscon.h>
  24 #include <linux/module.h>
  25 #include <linux/of.h>
  26 #include <linux/of_address.h>
  27 #include <linux/phy/phy.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/regmap.h>
  30 #include <linux/slab.h>
  31 #include <linux/workqueue.h>
  32
  33 #define ICFG_DRD_AFE            0x0
  34 #define ICFG_MISC_STAT          0x18
  35 #define ICFG_DRD_P0CTL          0x1C
  36 #define ICFG_STRAP_CTRL         0x20
  37 #define ICFG_FSM_CTRL           0x24
  38
  39 #define ICFG_DEV_BIT            BIT(2)
  40 #define IDM_RST_BIT             BIT(0)
  41 #define AFE_CORERDY_VDDC        BIT(18)
  42 #define PHY_PLL_RESETB          BIT(15)
  43 #define PHY_RESETB              BIT(14)
  44 #define PHY_PLL_LOCK            BIT(0)
  45
  46 #define DRD_DEV_MODE            BIT(20)
  47 #define OHCI_OVRCUR_POL         BIT(11)
  48 #define ICFG_OFF_MODE           BIT(6)
  49 #define PLL_LOCK_RETRY          1000
  50
  51 #define EVT_DEVICE              0
  52 #define EVT_HOST                1
  53
  54 #define DRD_HOST_MODE           (BIT(2) | BIT(3))
  55 #define DRD_DEVICE_MODE         (BIT(4) | BIT(5))
  56 #define DRD_HOST_VAL            0x803
  57 #define DRD_DEV_VAL             0x807
  58 #define GPIO_DELAY              20
  59
  60 struct ns2_phy_data;
  61 struct ns2_phy_driver {
  62         void __iomem *icfgdrd_regs;
  63         void __iomem *idmdrd_rst_ctrl;
  64         void __iomem *crmu_usb2_ctrl;
  65         void __iomem *usb2h_strap_reg;
  66         struct ns2_phy_data *data;
  67         struct extcon_dev *edev;
  68         struct gpio_desc *vbus_gpiod;
  69         struct gpio_desc *id_gpiod;
  70         int id_irq;
  71         int vbus_irq;
  72         unsigned long debounce_jiffies;
  73         struct delayed_work wq_extcon;
  74 };
  75
  76 struct ns2_phy_data {
  77         struct ns2_phy_driver *driver;
  78         struct phy *phy;
  79         int new_state;
  80 };
  81
  82 static const unsigned int usb_extcon_cable[] = {
  83         EXTCON_USB,
  84         EXTCON_USB_HOST,
  85         EXTCON_NONE,
  86 };
  87
  88 static inline int pll_lock_stat(u32 usb_reg, int reg_mask,
  89                                 struct ns2_phy_driver *driver)
  90 {
  91         u32 val;
  92
  93         return readl_poll_timeout_atomic(driver->icfgdrd_regs + usb_reg,
  94                                          val, (val & reg_mask), 1,
  95                                          PLL_LOCK_RETRY);
  96 }
  97
  98 static int ns2_drd_phy_init(struct phy *phy)
  99 {
 100         struct ns2_phy_data *data = phy_get_drvdata(phy);
 101         struct ns2_phy_driver *driver = data->driver;
 102         u32 val;
 103
 104         val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
 105
 106         if (data->new_state == EVT_HOST) {
 107                 val &= ~DRD_DEVICE_MODE;
 108                 val |= DRD_HOST_MODE;
 109         } else {
 110                 val &= ~DRD_HOST_MODE;
 111                 val |= DRD_DEVICE_MODE;
 112         }
 113         writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
 114
 115         return 0;
 116 }
 117
 118 static int ns2_drd_phy_poweroff(struct phy *phy)
 119 {
 120         struct ns2_phy_data *data = phy_get_drvdata(phy);
 121         struct ns2_phy_driver *driver = data->driver;
 122         u32 val;
 123
 124         val = readl(driver->crmu_usb2_ctrl);
 125         val &= ~AFE_CORERDY_VDDC;
 126         writel(val, driver->crmu_usb2_ctrl);
 127
 128         val = readl(driver->crmu_usb2_ctrl);
 129         val &= ~DRD_DEV_MODE;
 130         writel(val, driver->crmu_usb2_ctrl);
 131
 132         /* Disable Host and Device Mode */
 133         val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
 134         val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE | ICFG_OFF_MODE);
 135         writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
 136
 137         return 0;
 138 }
 139
 140 static int ns2_drd_phy_poweron(struct phy *phy)
 141 {
 142         struct ns2_phy_data *data = phy_get_drvdata(phy);
 143         struct ns2_phy_driver *driver = data->driver;
 144         u32 extcon_event = data->new_state;
 145         int ret;
 146         u32 val;
 147
 148         if (extcon_event == EVT_DEVICE) {
 149                 writel(DRD_DEV_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
 150
 151                 val = readl(driver->idmdrd_rst_ctrl);
 152                 val &= ~IDM_RST_BIT;
 153                 writel(val, driver->idmdrd_rst_ctrl);
 154
 155                 val = readl(driver->crmu_usb2_ctrl);
 156                 val |= (AFE_CORERDY_VDDC | DRD_DEV_MODE);
 157                 writel(val, driver->crmu_usb2_ctrl);
 158
 159                 /* Bring PHY and PHY_PLL out of Reset */
 160                 val = readl(driver->crmu_usb2_ctrl);
 161                 val |= (PHY_PLL_RESETB | PHY_RESETB);
 162                 writel(val, driver->crmu_usb2_ctrl);
 163
 164                 ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
 165                 if (ret < 0) {
 166                         dev_err(&phy->dev, "Phy PLL lock failed\n");
 167                         return ret;
 168                 }
 169         } else {
 170                 writel(DRD_HOST_VAL, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
 171
 172                 val = readl(driver->crmu_usb2_ctrl);
 173                 val |= AFE_CORERDY_VDDC;
 174                 writel(val, driver->crmu_usb2_ctrl);
 175
 176                 ret = pll_lock_stat(ICFG_MISC_STAT, PHY_PLL_LOCK, driver);
 177                 if (ret < 0) {
 178                         dev_err(&phy->dev, "Phy PLL lock failed\n");
 179                         return ret;
 180                 }
 181
 182                 val = readl(driver->idmdrd_rst_ctrl);
 183                 val &= ~IDM_RST_BIT;
 184                 writel(val, driver->idmdrd_rst_ctrl);
 185
 186                 /* port over current Polarity */
 187                 val = readl(driver->usb2h_strap_reg);
 188                 val |= OHCI_OVRCUR_POL;
 189                 writel(val, driver->usb2h_strap_reg);
 190         }
 191
 192         return 0;
 193 }
 194
 195 static void connect_change(struct ns2_phy_driver *driver)
 196 {
 197         u32 extcon_event;
 198         u32 val;
 199
 200         extcon_event = driver->data->new_state;
 201         val = readl(driver->icfgdrd_regs + ICFG_FSM_CTRL);
 202
 203         switch (extcon_event) {
 204         case EVT_DEVICE:
 205                 val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
 206                 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
 207
 208                 val = (val & ~DRD_HOST_MODE) | DRD_DEVICE_MODE;
 209                 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
 210
 211                 val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
 212                 val |= ICFG_DEV_BIT;
 213                 writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
 214                 break;
 215
 216         case EVT_HOST:
 217                 val &= ~(DRD_HOST_MODE | DRD_DEVICE_MODE);
 218                 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
 219
 220                 val = (val & ~DRD_DEVICE_MODE) | DRD_HOST_MODE;
 221                 writel(val, driver->icfgdrd_regs + ICFG_FSM_CTRL);
 222
 223                 val = readl(driver->usb2h_strap_reg);
 224                 val |= OHCI_OVRCUR_POL;
 225                 writel(val, driver->usb2h_strap_reg);
 226
 227                 val = readl(driver->icfgdrd_regs + ICFG_DRD_P0CTL);
 228                 val &= ~ICFG_DEV_BIT;
 229                 writel(val, driver->icfgdrd_regs + ICFG_DRD_P0CTL);
 230                 break;
 231
 232         default:
 233                 pr_err("Invalid extcon event\n");
 234                 break;
 235         }
 236 }
 237
 238 static void extcon_work(struct work_struct *work)
 239 {
 240         struct ns2_phy_driver *driver;
 241         int vbus;
 242         int id;
 243
 244         driver  = container_of(to_delayed_work(work),
 245                                struct ns2_phy_driver, wq_extcon);
 246
 247         id = gpiod_get_value_cansleep(driver->id_gpiod);
 248         vbus = gpiod_get_value_cansleep(driver->vbus_gpiod);
 249
 250         if (!id && vbus) { /* Host connected */
 251                 extcon_set_state_sync(driver->edev, EXTCON_USB_HOST, true);
 252                 pr_debug("Host cable connected\n");
 253                 driver->data->new_state = EVT_HOST;
 254                 connect_change(driver);
 255         } else if (id && !vbus) { /* Disconnected */
 256                 extcon_set_state_sync(driver->edev, EXTCON_USB_HOST, false);
 257                 extcon_set_state_sync(driver->edev, EXTCON_USB, false);
 258                 pr_debug("Cable disconnected\n");
 259         } else if (id && vbus) { /* Device connected */
 260                 extcon_set_state_sync(driver->edev, EXTCON_USB, true);
 261                 pr_debug("Device cable connected\n");
 262                 driver->data->new_state = EVT_DEVICE;
 263                 connect_change(driver);
 264         }
 265 }
 266
 267 static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
 268 {
 269         struct ns2_phy_driver *driver = dev_id;
 270
 271         queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
 272                            driver->debounce_jiffies);
 273
 274         return IRQ_HANDLED;
 275 }
 276
 277 static const struct phy_ops ops = {
 278         .init           = ns2_drd_phy_init,
 279         .power_on       = ns2_drd_phy_poweron,
 280         .power_off      = ns2_drd_phy_poweroff,
 281         .owner          = THIS_MODULE,
 282 };
 283
 284 static const struct of_device_id ns2_drd_phy_dt_ids[] = {
 285         { .compatible = "brcm,ns2-drd-phy", },
 286         { }
 287 };
 288 MODULE_DEVICE_TABLE(of, ns2_drd_phy_dt_ids);
 289
 290 static int ns2_drd_phy_probe(struct platform_device *pdev)
 291 {
 292         struct phy_provider *phy_provider;
 293         struct device *dev = &pdev->dev;
 294         struct ns2_phy_driver *driver;
 295         struct ns2_phy_data *data;
 296         int ret;
 297         u32 val;
 298
 299         driver = devm_kzalloc(dev, sizeof(struct ns2_phy_driver),
 300                               GFP_KERNEL);
 301         if (!driver)
 302                 return -ENOMEM;
 303
 304         driver->data = devm_kzalloc(dev, sizeof(struct ns2_phy_data),
 305                                   GFP_KERNEL);
 306         if (!driver->data)
 307                 return -ENOMEM;
 308
 309         driver->icfgdrd_regs = devm_platform_ioremap_resource_byname(pdev, "icfg");
 310         if (IS_ERR(driver->icfgdrd_regs))
 311                 return PTR_ERR(driver->icfgdrd_regs);
 312
 313         driver->idmdrd_rst_ctrl = devm_platform_ioremap_resource_byname(pdev, "rst-ctrl");
 314         if (IS_ERR(driver->idmdrd_rst_ctrl))
 315                 return PTR_ERR(driver->idmdrd_rst_ctrl);
 316
 317         driver->crmu_usb2_ctrl = devm_platform_ioremap_resource_byname(pdev, "crmu-ctrl");
 318         if (IS_ERR(driver->crmu_usb2_ctrl))
 319                 return PTR_ERR(driver->crmu_usb2_ctrl);
 320
 321         driver->usb2h_strap_reg = devm_platform_ioremap_resource_byname(pdev, "usb2-strap");
 322         if (IS_ERR(driver->usb2h_strap_reg))
 323                 return PTR_ERR(driver->usb2h_strap_reg);
 324
 325          /* create extcon */
 326         driver->id_gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
 327         if (IS_ERR(driver->id_gpiod)) {
 328                 dev_err(dev, "failed to get ID GPIO\n");
 329                 return PTR_ERR(driver->id_gpiod);
 330         }
 331         driver->vbus_gpiod = devm_gpiod_get(&pdev->dev, "vbus", GPIOD_IN);
 332         if (IS_ERR(driver->vbus_gpiod)) {
 333                 dev_err(dev, "failed to get VBUS GPIO\n");
 334                 return PTR_ERR(driver->vbus_gpiod);
 335         }
 336
 337         driver->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
 338         if (IS_ERR(driver->edev)) {
 339                 dev_err(dev, "failed to allocate extcon device\n");
 340                 return -ENOMEM;
 341         }
 342
 343         ret = devm_extcon_dev_register(dev, driver->edev);
 344         if (ret < 0) {
 345                 dev_err(dev, "failed to register extcon device\n");
 346                 return ret;
 347         }
 348
 349         ret = gpiod_set_debounce(driver->id_gpiod, GPIO_DELAY * 1000);
 350         if (ret < 0)
 351                 driver->debounce_jiffies = msecs_to_jiffies(GPIO_DELAY);
 352
 353         INIT_DELAYED_WORK(&driver->wq_extcon, extcon_work);
 354
 355         driver->id_irq = gpiod_to_irq(driver->id_gpiod);
 356         if (driver->id_irq < 0) {
 357                 dev_err(dev, "failed to get ID IRQ\n");
 358                 return driver->id_irq;
 359         }
 360
 361         driver->vbus_irq = gpiod_to_irq(driver->vbus_gpiod);
 362         if (driver->vbus_irq < 0) {
 363                 dev_err(dev, "failed to get ID IRQ\n");
 364                 return driver->vbus_irq;
 365         }
 366
 367         ret = devm_request_irq(dev, driver->id_irq, gpio_irq_handler,
 368                                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 369                                "usb_id", driver);
 370         if (ret < 0) {
 371                 dev_err(dev, "failed to request handler for ID IRQ\n");
 372                 return ret;
 373         }
 374
 375         ret = devm_request_irq(dev, driver->vbus_irq, gpio_irq_handler,
 376                                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 377                                "usb_vbus", driver);
 378         if (ret < 0) {
 379                 dev_err(dev, "failed to request handler for VBUS IRQ\n");
 380                 return ret;
 381         }
 382
 383         dev_set_drvdata(dev, driver);
 384
 385         /* Shutdown all ports. They can be powered up as required */
 386         val = readl(driver->crmu_usb2_ctrl);
 387         val &= ~(AFE_CORERDY_VDDC | PHY_RESETB);
 388         writel(val, driver->crmu_usb2_ctrl);
 389
 390         data = driver->data;
 391         data->phy = devm_phy_create(dev, dev->of_node, &ops);
 392         if (IS_ERR(data->phy)) {
 393                 dev_err(dev, "Failed to create usb drd phy\n");
 394                 return PTR_ERR(data->phy);
 395         }
 396
 397         data->driver = driver;
 398         phy_set_drvdata(data->phy, data);
 399
 400         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 401         if (IS_ERR(phy_provider)) {
 402                 dev_err(dev, "Failed to register as phy provider\n");
 403                 return PTR_ERR(phy_provider);
 404         }
 405
 406         platform_set_drvdata(pdev, driver);
 407
 408         dev_info(dev, "Registered NS2 DRD Phy device\n");
 409         queue_delayed_work(system_power_efficient_wq, &driver->wq_extcon,
 410                            driver->debounce_jiffies);
 411
 412         return 0;
 413 }
 414
 415 static struct platform_driver ns2_drd_phy_driver = {
 416         .probe = ns2_drd_phy_probe,
 417         .driver = {
 418                 .name = "bcm-ns2-usbphy",
 419                 .of_match_table = of_match_ptr(ns2_drd_phy_dt_ids),
 420         },
 421 };
 422 module_platform_driver(ns2_drd_phy_driver);
 423
 424 MODULE_ALIAS("platform:bcm-ns2-drd-phy");
 425 MODULE_AUTHOR("Broadcom");
 426 MODULE_DESCRIPTION("Broadcom NS2 USB2 PHY driver");
 427 MODULE_LICENSE("GPL v2");